Old friends await the seasoned gamer in the original Command & Conquer universe, as the fanatical Brotherhood of Nod battles the Global Defense Initiative in a war over the mineral Tiberium. Whether playing as the Brotherhood and obeying the charismatic Kane's every command or taking control of GDI forces as they seek to save the world from Kane's ambition, every detail of Command & Conquer is just as you remember it. The original full motion videos tell the story in what was once cutting-edge and is now quaint, and the gameplay is simple as can be. Gather Tiberium to produce tanks, infantry and more to decide the fate of the world, or try to connect to others with one of the first online game-finding services!
Command & Conquer
OpenRA is my favourite free and open-source real-time strategy (RTS) game available for Linux, although it is unusual that it is written in C#, although given the fact its graphics are basic and simple this isn't much of a problem. The room for improvement that exists for it is to add the ability to adjust the difficulty level of the AI. Sometimes it is just too easy to defeat them, regardless of the AI played.